Thanks for your help powerin.lt!
OK, I've updated my firmware to V4.002.0000000.6.R, Build Date: 2022-11-15 and still can't get this to work, I get the same results.
I've tried pasting: http://xxx:xxx@10.10.1.108/cgi-bin/configManager.cgi?action=getConfig&name=VideoAnalyseRule
into Edge and...